steeler Posted 23 hours ago Share Posted 23 hours ago Hey all, I normally don't run into something like this that isn't fairly easy to diagnose... But I'm working on a 2018 mp8 that needs parked regen daily. Originally came in shop with whacky exhaust temps during regen. Dpf filter was junk. Replaced filter and new 1 box. Exhaust temps during regen look great, soot drops to 0, but rises quickly during the day. I replaced the Dpf diff pressure sensor and all temp sensors during this process. Engine runs great. Vgt sweep is good, egr cooler not leaking. No exhaust or boost leaks. A little stumped! Quote Link to comment https://www.bigmacktrucks.com/topic/75271-frequent-regen-issue/ Share on other sites More sharing options...
fjh Posted 17 hours ago Share Posted 17 hours ago Egr diff sensor ? Venturi ports clogged? 1 Quote Link to comment https://www.bigmacktrucks.com/topic/75271-frequent-regen-issue/#findComment-571152 Share on other sites More sharing options...
steeler Posted 14 hours ago Author Share Posted 14 hours ago 3 hours ago, fjh said: Egr diff sensor ? Venturi ports clogged? I did check ports and they are clear. Customer wants to go ahead and throw a set of injectors at it. I'm skeptical... I've seen bag injectors cause funky regents, but I haven't seen them cause frequent regen. Not on a mack anyway. I did run into that with a Cummins. Quote Link to comment https://www.bigmacktrucks.com/topic/75271-frequent-regen-issue/#findComment-571160 Share on other sites More sharing options...
fjh Posted 13 hours ago Share Posted 13 hours ago 44 minutes ago, steeler said: I did check ports and they are clear. Customer wants to go ahead and throw a set of injectors at it. I'm skeptical... I've seen bag injectors cause funky regents, but I haven't seen them cause frequent regen. Not on a mack anyway. I did run into that with a Cummins. Fuel pressure at 7th? Just throwing it out there! Not a guru by any stretch! 1 Quote Link to comment https://www.bigmacktrucks.com/topic/75271-frequent-regen-issue/#findComment-571164 Share on other sites More sharing options...
steeler Posted 2 hours ago Author Share Posted 2 hours ago 11 hours ago, fjh said: Fuel pressure at 7th? Just throwing it out there! Not a guru by any stretch! And I appreciate you! After treatment fuel pressure is 65. All the numbers during regen look great, but something is causing it to soot up pretty quick while driving. Quote Link to comment https://www.bigmacktrucks.com/topic/75271-frequent-regen-issue/#findComment-571188 Share on other sites More sharing options...
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